Did you know that heartworms and fleas can affect indoor and outdoor cats? Selarid Topical Solution for Cats, 5.1-15 lbs. is a monthly topical prevention option for flea infestations, heartworm disease and more. Formulated with the same active ingredient as the pioneer product Revolution Topical Solution, this quick-drying, non-greasy solution delivers parasite control at an affordable price, keeping your feline friend and your wallet happy!**We directly source prescription medications from manufacturers and wholesale distributors registered with the FDA and licensed by applicable state boards. Guaranteed genuine, and where applicable, backed by the manufacturer.**